What’s Vulnerable › Vulnerabilities
CVE-2021-42009: Apache Traffic Control Traffic Ops Email Injection Vulnerability
- Severity: medium (CVSS 4.3 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 2.8% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-10-12 · updated 2026-06-17
- Weakness: CWE-20
Description
An authenticated Apache Traffic Control Traffic Ops user with Portal-level privileges can send a request with a specially-crafted email subject to the /deliveryservices/request Traffic Ops endpoint to send an email, from the Traffic Ops server, with an arbitrary body to an arbitrary email address. Apache Traffic Control 5.1.x users should upgrade to 5.1.3 or 6.0.0. 4.1.x users should upgrade to 5.1.3.
Affected products
- Apache Software Foundation Apache Traffic Control: from 4.1.0 before 5.1.3 — fixed in 5.1.3
How to fix
Upgrade to a fixed version: Apache Software Foundation Apache Traffic Control 5.1.3. Check the vendor advisory for mitigations.
References
- http://www.openwall.com/lists/oss-security/2021/10/12/1
- https://lists.apache.org/thread.html/r78d471d8a4fd268a4c5ae6c47327c09d9d4b4467c31da2c97422febb%40%3Cdev.trafficcontrol.apache.org%3E
- https://lists.apache.org/thread.html/r7dfa9a89b39d06caeeeb7b5cdc41b3493a9b86cc6cfa059d3f349d87%40%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/re384fd0f44c6d230f31376153c6e8b59e4a669f927c1533d06d702af%40%3Cdev.trafficcontrol.apache.org%3E
- https://lists.apache.org/thread.html/rf0481b9e38ece1ece458d3ce7b2d671df819e3555597f31fc34f084e%40%3Ccommits.trafficcontrol.apache.org%3E
- http://www.openwall.com/lists/oss-security/2021/10/12/1
- https://lists.apache.org/thread.html/r78d471d8a4fd268a4c5ae6c47327c09d9d4b4467c31da2c97422febb%40%3Cdev.trafficcontrol.apache.org%3E
- https://lists.apache.org/thread.html/r7dfa9a89b39d06caeeeb7b5cdc41b3493a9b86cc6cfa059d3f349d87%40%3Cannounce.apache.org%3E
- https://lists.apache.org/thread.html/re384fd0f44c6d230f31376153c6e8b59e4a669f927c1533d06d702af%40%3Cdev.trafficcontrol.apache.org%3E
- https://lists.apache.org/thread.html/rf0481b9e38ece1ece458d3ce7b2d671df819e3555597f31fc34f084e%40%3Ccommits.trafficcontrol.apache.org%3E
Get alerted when CVE-2021-42009 or the next vulnerability affects your stack